Narrow Leaflet Type

Narrow Leaflet Type refers to cannabis plants exhibiting characteristically thin, elongated leaflets—a morphological trait distinct from the broader leaves typical of indica-dominant genetics. This phenotype is commonly associated with sativa lineages and equatorial breeding regions, where narrower leaf structures may have offered adaptive advantages in high-light, humid environments. Narrow leaflets are easily observable during vegetative growth and remain consistent through flowering. Breeders working in sativa-focused programs often use leaflet width as a visual selection marker for lineage authentication and phenotype stability. The trait has no direct bearing on cannabinoid or terpene production but serves as a useful morphological descriptor in pedigree documentation.

Narrow leaflet morphology is frequently used by breeders as a quick visual indicator of sativa genetic influence and regional heritage. Selection for or against this trait helps maintain breeding population consistency and supports phenotype differentiation in hybrid programs.